Two approaches are on offer. Some think the best way to limit emissions is to tax them; others argue for a system that sets a cap on pollution, and lets polluters trade the right to emit.

可供选择的方法有两种：有的人认为向排放物征税是最佳的限制手段；其他人支持一种对污染物施加管制的方案，并允许污染者将排放权进行交易。

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Obama's plan would end Bush-era tax cuts for top earners and would limit their deductions.

奥巴马的计划将终结布什期间针对劳动收入的税收减让，还将限制劳动收入的税前扣除。

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Is this within the tax-free limit?

这个在免税限额内吗？

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The bill,which now goes to the Senate, would remove a $75 million limit on liability for oil spill damages and put a new tax on the industry to fund nationwide conservation projects.

VOA: standard.2010.07.31

If you feel like the estate-tax exemption limit has bounced around a lot, you're right.

WSJ: Family Value: New Hazards for Estate Plans

"The Conservatives have made a series of uncosted tax promises - tax bribes, " said Mr Clegg, referring to Tory promises to recognise marriage in the tax system, limit the National Insurance rise, freeze council tax and raise the inheritance tax threshold.

BBC: Nick Clegg launches Scottish Lib Dem election campaign

Meanwhile a Tory Chancellor, George Osborne, is convinced that those on the highest incomes are not making a proper contribution to the reduction of the government's excessive deficit - and so he wants to limit their ability to avoid tax, including through his controversial plan to limit how much they can cut their tax bill by making big contributions to charity.

BBC: More than 70% of high earners paid 50% tax rate